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Depression (mood)

state of low mood and aversion to activity

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Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionSep 17, 2026
Entity authorityQ4340209
Source-derived summary

Depression is a mental state of low mood and aversion to activity. It affects about 3.5% of the global population, or about 280 million people worldwide, as of 2020. Depression affects a person's thoughts, behavior, feelings, and sense of well-being. The pleasure or joy that a person gets from certain experiences is reduced, and the afflicted person often experiences a loss of motivation or interest in those activities. People with depression may experience sadness, feelings of dejection or lack of hope, difficulty in thinking and concentration, hypersomnia or insomnia, overeating or anorexia, or suicidal thoughts.

Depression can have multiple, sometimes overlapping, origins. Depression can be a normal temporary reaction to life events, such as the loss of a loved one. Additionally, depression can be a symptom of some mood disorders, such as major depressive disorder, bipolar disorder, and dysthymia. Depression is also a symptom of some physical diseases and a side effect of some drugs and medical treatments.

Contributing factors

Life events

Adversity in childhood, such as bereavement, neglect, mental abuse, physical abuse, sexual abuse, or unequal parental treatment of siblings, can contribute to depression in adulthood.

Editorial summary

Begin with the source’s own compact description: “Depression (mood)” is state of low mood and aversion to activity. The dossier treats that line as a proposition to test through Depression, mood and state, not as a finished interpretation.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current lead gives the account dated anchors—2020—that can be checked directly. The selected authority fields contribute no independent date. For this dossier, Depression, mood and state is the immediate research focus.
Editorial analysis

Why this record matters

The phrase “state of low mood and aversion to activity” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.

Evidence profile

The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q4340209. The first chronological checks are 2020.

Critical limits

Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

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Source & attribution

This entry incorporates text from Depression (mood)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.